Harvia L22LS/RS Series Protective SheathProtective Sheath for Harvia Sauna Stoves, LS LINEAR 22 RS LS The Harvia WL585 protective sheath is designed and approved for wood heated Harvia wood burning heaters (Harvia 22 RS and LS Linear 22 RS and LS). The protective sheath considerably reduces the safety distance to combustible materials in practice, this makes the wood burning heater fit in a smaller space. The protective sheath is attached to the wood burning heater and conforms to the shape